Granted Patent
Utility
US 5,176,753 · App. 07/790,950
Concrete admixture compositions
Inventor:
John W. Brook
Patented Case
View Patent ↗
Granted: Jan 5, 1993
Filed: Nov 12, 1991
Inventor
John W. Brook
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.